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Notice: Use of undefined constant WPINC - assumed 'WPINC' in /public_html/wp-includes/class-IXR.php on line 42

Warning: require_once(ABSPATHWPINC/IXR/class-IXR-server.php): failed to open stream: No such file or directory in /public_html/wp-includes/class-IXR.php on line 42

Fatal error: require_once(): Failed opening required 'ABSPATHWPINC/IXR/class-IXR-server.php' (include_path='.:/opt/php55/lib/php') in /public_html/wp-includes/class-IXR.php on line 42